That’s really weird. I have tested WordAI and Spin Rewriter with Copyscape and the results were always 80%+ uniquness, even 90%+. I don’t know how u spun the content to achieve such low results, but this is definitely way too bad. As for the block spinning, I have to be honest, this is the first time I’m hearing of it and I will have to check it out when I have a bit of time, but generally, yes, in the best case scenario, you would manually touch your Tier 1 content to make it 100% human readable and as unique as possible. For lower tiers, you can do pretty much anything, but again, the better quality of content, the better results you will have. That’s in my opinion and experience.
This free online paraphrasing tool can deliver reliable results both in terms of human readership and search engine exposure. This means, with our text rewriting tool, you'll be able to continually update your blog, social media pages, and website with fresh content. Note that we NOT talking about content that will get you penalized by Google or content that looks like machine written gibberish. But an automatically generated high-quality content that your readers and Google actually loves. 

Once upon a time there lived a boy. He had blue eyes with blond hair as yellow as gold. The young boy was small and fragile, but his mind was swift like the wind. He could calculate the outcome of any situation in the blink of an eye. But that was not his biggest talent. No. His biggest talent was perception. The young boy could understand and perceive anything faster than anyone he had ever met. Then, he fell in love with a beautiful princess. She had magnetic green eyes and light brown hair. He loved her very much and she loved him back even more. There was only one problem – the young boy was the son of a blacksmith. The princess’s father would never allow her to marry a simple son of a blacksmith. But their love was too strong. In one fell swoop, the young boy raised an army of undead and started a rebellion to overthrow the evil king who did not believe in true love. After months of fighting against the armies of his beloved’s father, the young boy was assassinated and the war was over. No songs were sang.
Digital content, digital media, digital earnings; these three are today’s most important topics of the web arena. Today, content is the king as well as the queen , there should be no compromise, therefore, on unique content. We have become so used to using online tools that sometimes we find ourselves at a complete loss of words. We know what we want to say, but we somehow cannot figure out the words to say it. This is even more problematic when we have a document which we want to re-write in such a way that it becomes unique.

Spin Rewriter integrates with almost any SEO software. This allows you to post high quality articles quickly and easily. The only drawback is that you only get something like 300 API requests every 24 hours. You can quickly burn through this if you’re doing multiple campaigns. The developer does not currently offer a plan for heavy API users but maybe they will in the future.